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Mr. Murray <br /> Page 12 <br /> June 1, 2016 <br /> 5. The changes to the size of the phases are being made to account for MSHA requirements. <br /> Please specify the dimensions of the benches which will be used to minimize the height of <br /> the highwall. In addition, provide a brief description of how the benches will be constructed. <br /> 6. The Operator has proposed to change how stormwater will be managed at the site. <br /> Specifically, the Operator is proposing to remove a series of ditches and ponds. Please <br /> identify the ponds and ditches which will be eliminated. In addition, the Division requests a <br /> revised copy of the C-4 Hydrology Map,which was submitted under Amendment No. 5. The <br /> revised map should reflect the proposed changes, including the new diversion ditch. <br /> 7. Under Amendment No. 5, the Operator committed to having no more than 3 phases active at <br /> any one time. The active phases would include a combination of topsoil stripping, active <br /> mining and active reclamation. Please clarify if the number of phases open at any given time <br /> will change. <br /> 8. The Operator has revised the mining phases and has changed the phase ID from a numeric <br /> system to a lettering system. Please identify the individual phases and specify the acreage <br /> associated with each in a table format. <br /> This concludes the Division's preliminary adequacy review of this Technical Revision. Please <br /> remember that the decision date for this Technical Revision is June 3, 2016. As previously <br /> mentioned, if you are unable to provide satisfactory responses to any inadequacies prior to this <br /> date, it will be your responsibility to request an extension of time to allow for continued review <br /> of this Technical Revision. If there are still unresolved issues when the decision date arrives and <br /> no extension has been requested, the Technical Revision will be denied. <br /> If you have any questions, please contact me at (303)866-3567 x8116. <br /> Sincerely, <br /> Michael A. Cu ingham <br /> Environmental Protection Specialist <br /> CC: Wally Erickson, DRMS <br /> Ben Miller, Greg Lewicki & Associates <br />